Electro-optic coherent light detector

Details Electro-optic coherent light detector Electro-optic coherent light detector

1991-01-11

1993-09-14

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356352, 356353, 356346, 356347, 2503381, G01B 902

Patent

active

052454088

ABSTRACT:
An apparatus is described which detects the presence or absence of coherent light and provides an estimate of the coherent light's wavelength. The apparatus employs a common-path "polarization interferometer" in which the two linear polarization paths act as interferometer legs. Electro-optic modulation is used to effect periodic differential path length changes in the interferometer. The apparatus performs synchronous time-integrating detection on the light emerging from the interferometer to measure coherent contributions in the presence of obscuring incoherent light.

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J. Jannson, T. Jannson, and E. Wolf: "Spatial Coherence Discrimination In Scattering," Optics Letters, vol. 13, 12, Dec. 1988, pp. 1060-1062.
C. J. Duffy and D. Hickman: "A Temporal Coherence-Based Optical Sensor," Sensors and Actuators, vol. 18, 1989, pp. 17-31.

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